QUIZ 2 (NMK30103 SEM 2)

Define the term Pulse Modulation

• A process by which the wave signal is transmitted by modulating the amplitude of the signal.

• A type of modulation in which the signal is transmitted in the form of pulses.

• The encoding of information in a carrier wave by changing the instantaneous frequency of the wave

• The phase of the carrier wave is changed according to the amplitude of the message signal.

All of the techniques are the type of analog pulse modulation EXCEPT

​ ​ ​ ​ ​ ​ ​

• Pulse Amplitude Modulation

• Pulse Width Modulation

• Pulse Position Modulation

• Pulse Code Modulation

There are types of sampling methods EXCEPT

• Natural

• Ideal

• Modulation

• Flat-Top

Please complete the block diagram

a)​

b)​ ​ ​

c) ​

• a) Sampling

  b) Quantization

  c) Encoded

• a) Quantization

  b) Sampling

  c) Encoded

• a) Encoded

  b)Sampling

  c) Quantization

• a) Sampling

  b) Encoded

  c) Quantization

Advantages of digital modulation is

• Increase bandwidth

• Increase noise

• Increase power consumption

• Increase energy

All of the techniques are in Digital Modulation EXCEPTS

• Amplitude Shift Keying

• Pulse Code Modulation

• Frequency Shift Keying

• Quadrature Amplitude Modulation

Name the generated signal based on labelling (a) for digital modulation

​

• Information signal

• Carrier signal with low frequency

• Carrier signal with high frequency

• Modulated signal

• Sampling signal

If the bit rate is 4800bps, what is the baud rate?

• 1200 baud

• 1400 baud

• 1600 baud

• 1650 baud

Compute a bit for 64-QAM signal

• 4 bit

• 6 bit

• 8 bit

• 7 bit

ALL statement are definition of modulation EXCEPT

• Convert digital signal to analog signal

• A process of varying one or more properties of a periodic waveform with a separate signal

• Transmit a signal to receiver via channel

• Convert low signal frequency to high signal frequency